As the story of Delta flight 3163 being quarantined after landing at Chicago's Midway International Airport broke Thursday afternoon, scant details of a passenger with a medical issue started to unfold — which got many people wondering, what could have happened?

Aviation officials in Chicago said the city's health department and fire department responded to a flight that landed at Midway International Airport, but local police and fire officials told Fox News the Centers for Disease Control and Prevention (CDC) was handling it.